Instrument to determine prestress remaining in a damaged bridge girder

Scott A. Civjan; James O. Jirsa; Ramon L. Carrasquillo; David W. Fowler

doi:10.1117/12.300104

31 March 1998 Instrument to determine prestress remaining in a damaged bridge girder

Scott A. Civjan, James O. Jirsa, Ramon L. Carrasquillo, David W. Fowler

Author Affiliations +

Proceedings Volume 3400, Structural Materials Technology III: An NDT Conference; (1998) https://doi.org/10.1117/12.300104
Event: Non-Destructive Evaluation Techniques for Aging Infrastructure and Manufacturing, 1998, San Antonio, TX, United States

Abstract

An instrument has been developed to estimate stress levels in prestress strands in existing members. The prototype instrument applies a lateral load to an exposed prestressing strand and measures the resulting displacements. The instrument was calibrated for 0.5-inch (12.7 mm) diameter seven-wire strand with exposed lengths of 1.5 feet (0.46 m) to 3.75 feet (1.14 m). It was tested to determine its accuracy, precision, and usefulness in the field. Strand forces were consistently estimated to within ten percent of the actual load. The device was also utilized in the placement of strand splices and was found to be more reliable in checking induced strand tensions than the standard torque wrench method.

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Scott A. Civjan, James O. Jirsa, Ramon L. Carrasquillo, and David W. Fowler "Instrument to determine prestress remaining in a damaged bridge girder", Proc. SPIE 3400, Structural Materials Technology III: An NDT Conference, (31 March 1998); https://doi.org/10.1117/12.300104

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